Sewing machine



March 20,1945. R. NAFTALI ETAL 2,372,105

SEWING MACHINE Originai Filed July 19, 1935 5 Sheets-Sheet l INVENTORRUDOLF- NRFTRLJ VALENHNE NRFTALI BY HENRY N F-mu AT ORNEY Maych 20,1945.' R NAFTAU ETAL I 2,372,105

SEWING MACHINE Original Filed'July 19, 1935 5 Sheets-Sheet 2 INVENTORRuoow NAFTAL\- VALENHNE NAFTAU BY HENR NRF MA I ATTORNE March 20, 1945.R. NAFTALI ET AL. I 2,372,105

SEWING MACHINE Original Filed July 19, 1935 1 5 Sheets-Sheet 3 RUDOLFNAFTALI VALENHNE NAFTALI BY HENRY NAFTA ATTORQIEY March 20, 1945.NAFTAL] ETAL 2,372,105

v SEWINGMACHINE;

Original Filed July 19, 1935' 5 Sheets-Sheet 5 1 "O Wig-16: INVENTORVRLENTINE NRFTAU A TQRNEY y from pulley 32, said collar being adapted torotate freely on shaft 33. Mounted on said collar for rotation therewithis a gear 35, cam 31 and cam 33. By this construction it is seen thatcams 31 and 38, and gear 36 are integrally connected to move as a unitwhen pulley 32 is driven by the belt 3i. Said cams 3'! and 38, as wellas gear 36, are fixedly mounted on collar 35, which is designed torotate freely about shaft 33. is provided with an annular grove in whichrollers 39' are guided, said rollers being mounted on shafts ill fixedto plates 4|. It is seen from the above construction that plates 4] willbe caused to oscillate with a predetermined regularity in accordancewith the path of the annular groove in cam 38. This predetermined degreeof oscillation of plates 4| may be made to be of the same amount asdesired for the oscillation of, upper needle bar 59 and lower needle bar5! to alternately clutch the double pointed needle 52 after it haspierced the material to be stitched. The oscillatory motion of plates 4!may be transmitted therefrom to needle bars and 5| by means such asrocker arms 53 and 54 pivoted to the casing at 55 and 56, respectively.Rocker arm 53 is connected to needle bar 50 by means of a link link 51and to plates 4| bymeans of a link 58, while rocker arm 54 may beconnected to lower needle bar 5| by means of a link 59, and to lates 4!by means of a link 60.

During the operation of-our apparatus, as fully described in our PatentNo. 1,931,447, it was found that much time was lost by the operator inthe mounted on threader 65 and adapted to ride on lower jaw 68 to forcesaid jaw 68 downwardly against the action of spring 1 I. As the threader85 is pulled back to be withdrawn from the eye of the needle, hook 66carries one end of the thread through the eye of the needle to threadthe same and thence between the opened jaws 51 and 68. At the same timecam 69 allows lower jaw 68 to resume its normally closed position togrip the thread T between the teeth of the upper and lower jaws 61 and68 to hold said thread in a fixed position. One end of thread T is thusthreading of the needle and in securing one end of the thread in a fixedposition until the stitching of the tie has been completed, at whichtime the thread had to be released by some means such as cutting withaknife or breaking.

We have, therefore, devised a novel mechanism by means of which theneedle may be quickly threaded, after-which one end of the thread isautomatically grasped and'held until the stitching of the tie has beencompleted, at which time the held thread is then automatically released.The mechanism by which we accomplish this may be described as follows: i

A threader 65 (see Figure 3) having a threading hook 66 at one end and ahandle I51 at the other end, is pivotally mounted on a shaft I58 in link51 fixed to upper rocker arm 53. By this construction it is seen. thathook 66, which is adapted to pierce the'eye of the needle 52 to threadit, will always be in proper position to I pierce the eye of the needle52 when said needle over the hook, is ready to be threaded in the eye ofthe needle.

By referring to Figures 3 and 15, it will be noted that a pair of jaws61 and 68 of a graspnig device 10, supported on the machine casing, areshown held in effective Or closed position by the action of a spring 1I, whereas in Figure 16 it is seen that when the threader hook 66 hasbeen inserted through the eye of the needle, the jaws 5! and 68 of thegrasping device 10 have been forced open by meansof a cam 69 rotatablyheld fixed for a predetermined time, such as when the tie has beencompletely stitched, when it is automatically released. Grasping device10 is adjustably mounted on a plate fixed by screws 8! to carriage l3,and held in any desired adjusted position by means of a bolt slidable inan elongated slot 82 in plate 80, and having its head 84 slidable in acomplimentary slot formed in carriage 13. The bolt may be secured inadjusted position by means of a nut 10a (Figures 14 to 16). We haveprovided the following means for automatically releasing the held threadat such predetermined time. A vertical plate 12 is mounted on themachine frame at one side of an intermittently traveling work carriage13 (see Figure 14). The mechanism by which this work carriage is movedwill become apparent as the description proceeds. Attached to plate 12is a track 14 inclined with respect to the horizontal and suitablypositioned and adapted to have a roller 15 ride thereon, said roller 15being rotatably mounted on the extended end of lower jaw 68 (see Figure16) Lower jaw 68 is made to pivot about an axis 76. When the workcarriage 73 travels in the direction of the arrow (Figure '7) for apredetermined distance, roller 15 will ride on inclined track 14 tocause lower jaw 68 of the grasping device 10 to automatically releasethe thread T.

In stitching machines of the type described, wherein a looper isemployed and where the loose end of the thread is pulled through thework after the completion of each stitch, it is particularly desirableto provide means to prevent the two strands of the thread cooperatingwith the needle and the work from becoming intertwined or entangled.Should the thread become entangled, the looper or the thread pullerwould tend to engage both strands of thread, and since one end of thethread is held fixed, it would be broken thus causing delay andinefflciency. To obviate this disadvantage we have devised novel threadholding mechanisms designed to constantly maintain the thread inposition to prevent tangling. We will first describe the operation ofour thread holding mechanism as applied to the needle, when said needleis connected to the upper needle bar 50. Then the operation of themechanism which we employ to hold the thread when the needle isconnected to the lower needle bar 5| will be described.

In Figures 7 and 8 of the drawings there is disclosed upper needle bar50 slidably operating in the frame C, said frame having attached theretoa bracket 80a. An arm 8|a is pivoted at one end to bracket 80a at apoint 82a. Arm 8la may be held pressed into engagement with needle 52 bysuitable means such as an adjustable spring 83. A stop 84a, fastened tothe frame of the machine, is provided to limit the pressure of arm 8| (1against the needle 52 to prevent breaking of the needle. On the oppositeside of the needle 52 from that of arm am we provide another arm 86.

ite be acted uponby a speciaiiy designed *looper -*Anotherthreadholding-mechanism is al'soiproyided to hold the strands of the' threadwhen the "needle is connected to the flower "needle bar 5 IReferring-to" F-igure 3', there' is disclosed a cam -m'ember9 I fixedfto'-rocker"arrn '54'. Cam n'ieniber WI is provided-With a Slotted portion"92. link "is pivotal-1y connected to thmadhine easing at 8. fpo'intfllsaid link-'93 having 'ffiiied' thereto afiain 95 "adapted to engagethe slot92 to'cause l'ihk l 'to traveHnan oscillatorypath about pivot9'4-Wheneyer-rocker arm 54 is moved. A forked 1 member -96 is"pivotallyattached to link 93 at *0! at-one end, and "toe lever '98 at'a' point'99. Lever *Qfl is pivotedtd'th'e' machine casting at "l00 ,as*shoWn-infletafl *in Figure "10. Forked Inember 96 has extensionarin'members which" arezadaptedfto -straddle and press against theneed1e"52 at opp'osite side' thereof to' maintain the thread inproperali-gnmentto prevent entanglement. Cam *mem-ber -l is'so designedas tomaintain the lower "thread holding mechanism; asjust described, in*effe'ctive *positiofr until such time as "thethread is acted upon-bya"specia11 y designed thread puller; similar to that shown and describedin our J P'a'tenii{N01 1,931344'7; and which will he discussed "morefully asthe'"descriptiodproceeds. p To further-increase the efficiencyof operation of our stitching-machine;*we have devised a novelmechariism which we call aioo'p'er; the operation "or 'wh-ichwillnow beexplained} Referring first to Figure '7 of 'thedrawings, thereisjdisc'los'ed a *looper I '05; one end-dfwhich is piyotallymountedonthe' machine "casingat a "point'such as I06. Uournaied in said machine"casing is a shaftJOT 6sec also Figure 51') having mounted thereon atone end a lever I08. said lever I08 is connected to -1ooperl05 *by meansor a link I09, one end of "which is pivotaliy fastened to looper I05 ata point such as I 'I 0, the other end being 'pivotally connectedtoieve'r I08 at III. 'Thus'itc'afifbe "seen that 'when shaft HIT is;"rotated,'1oo'per I05 'wili' he caused to" oscillate about "pivot I06."I'he degree and r'e'gu larity of this oscillation may be governed bymeans of a lever H5 mounted on iits'haft w'l and prov'idedwith a camfollower, such The contour'of cam 'al m'ay'be such as to cause loeper=I' 05,"-through the linkage system just] described; toesci llate Iabout its; pivot! 00 at predetem'lined'dnterv'als "hem"- an inoperativeposition snnwn in dotted lms-in Fi ure 7; to'aeveneed op 'iveposi tioh's eh essnownin full lines' in Figures 11' and 13, an'ci engage thethread after upon the downwardtravel ofthe uppernedle har. "Loo'per 105;which may use any" suitable "hook rneans for engaging the thread, sucha's a "spooH-ike projection I I6 mounted on apin' 105a earne in arm I05,travels to the left from' its -inoperative position (as viewedin Figure"1-).

'Spoel like projection "I 18 ("see Figure '3) "has-"assoei'atedtherewith aroller use rotatably mount- "ed onpin I-OBG/ carried by' thelooper arm. "In'this way the loope'r en gages the thread; forms a loop-(as *shewn in Figures arena" 13) andexerts suf- ""fldint pulling frce0n the 16086 'eh'd- Of the thread to pull a smn-rpenmntmreor backthrough the T work' and thereby-provide slack therein. When Tooper I 05occupies th'position "shown in Figures 20 ll and liii andthread puller-I20 engages -the thread beneath the work-and adjacent'the lowerneedle-bar; ro'ller -II6a"act's as a guideio'rthe floos'e end of thethreadasit is pulled-through-the *werk by the threa'd puller I20 anddeposited ahout drum I21. From the abovefie'scriptionof t-heoperazition-of the looper; it 'is' apparent that the loose end oft-hethread T--is prevented from becoming entanglewand broken when the needle52' is-sh-ifted rrem -the' upper needle bar; as in Figure 7, to beclutched by t-he lower hee'dl'e'bm as shown in Figure IO. n rtnermerewethread will he' properly guidedby' roller "I I 6a with '-''a"substantial -elimi'hation of friction on the thread as it is pulled'hythe puller-120. Als duetetheprovision of slack, each stitch formed'wi-ll be properly tensionedinthematerial being sewed. This last "feature'is also enhanced by the fact "that cam 31 is so designed that a slig-htrearward 'o'r're. Yttirn movement is imparted to "iooper I05"a's the'needle moves through the work on its downward fin'ov'e'ment. Themechanism for operating the --'1ooper I05, justdescribed, is designedtoact in "cooperative -re1ation"with the thread holding means*hereinabovedescribed in connection with the upper'needle bar-50.

' The mech'anism which we employ in our improved apparatus to engagethefloop's as they are "formed from the thread institching andtodraw orpull out the free end portion of the thread atter each stitchmay 'besimilar to that shown and "described in our *Patent'No. 1,931,447,here-- "inbefore mentioned; The Operation of the above {describedmechanism will'be clearly understood from 'a study of Figures 3 and? ofthe drawings twin-which itis 'seen that gear 36 ismountedfor rotationwithipulley '32, and that when said gear -36 isr'otated it causes athread puller I20 to be I "carried in a circular "path around theperiphery 0 "of aflstatio'nary grooved drum I2I, by means of a ed'chainof gears: "(Figure 3), I22, I23 and I24. The following mechanism may beemployed to cause thread p1111erl'20 to travel in its circular path? I 1p Gear "I2 4 is 'so'mounted that it isin eccentricr'eesjati'ontothe'axi's"ofthegrooved drum I 21. Fixed fto gear I24'forrotation'therewith isan annular "plate 124'. The thread puller I20 isfixed to the outer end' of a carrier arm I25, said carrier'jarm "beingfiivoted at its'innef'end to the drum I2I at a point I26 coincident withthe center of said idrum I21 Carrier arm I25 is providedfwitha"longitudinal slot I21'into' which a blo'ck'l28, fixed to the outer edgeof annular disc I24, is "adapted to slide. Thus it"isf si enthat when.g''ar I24 is i-. "ietstea'jtne threadpuller "I20 is caused to travelaround drum I2I. The mechanism for operating the thread puller, as justdescribed, is designed to act in cooperative relation with the threadholding means hereinbefore described in connection with the lower needlebar 5 I.

The function of the stationary circular grooved drum I2I is similar tothat shown and described inour Patent No. 1,931,447. Briefly stated, itis to support the loose portion of the thread on the periphery of saiddrum I2I after the said thread has been pulled out from the fabric bythe thread puller I20. Figures 11 and 13 clearly illustrate two steps inthis action. Drum I2I may be provided with grooves I as shown in Figure12, to prevent, entanglement of adjacent strands of the thread whilethey rest on said drum I2 I. To further safeguard against the possibleentanglement of the loose portion of the thread while it is being guidedonto drum I2I and into grooves I29, ,we

have devised a novel thread holding means which may comprise a pluralityof brushes I held in engagement with grooves I29 of the drum |2Ieificient mechanism than heretofore employed for intermittentlyadvancing the platform carrying the fabric to be stitched. I

By referring to the drawings, the operation of the above mentionedmechanism will be clearly understood. In Figure 7, we have disclosed aportion of the work carriage or the traveling platform I3 adapted totravel along any suitable guide means or tracks, such as shown anddescribed in our Patent No. 1,931,447. On the underside of said platformI3 there is provided a toothed rack I 35. On a shaft I3'I fixed to themachine casing C we mount a gear I36 designed to mesh with said rackI35. The means by which gear I36 may be intermittently rotated tointermittently advance the platform I3 may be described as follows:

On the shaft I3'I we also mount a notched wheel 2,872,106 scribed.Referring first to Figure 5, we have shown an enlarged view in sectionof the mechanism of the upper needle bar to which is screwed at itslower end a tapered chuck 90.

Within the hollowed interior of chuck 90 we provide three balls B (seeFigure 6) arranged so as to permit needle 52 to be inserted between themand held thereby. When the balls B are pressed downwardly, the taperedportion of chuck 90 forces them together to grip the needle 52. Thisdownward pressure is applied by means of a spring I50 pressing against ashank I5I which in turn presses on the balls B. The upper end of saidspring I50 abuts against a member I52 screwed into the top portion ofneedle bar 50.

The upper end of shank I5I extends through member I52 and is fixed to astop I53, the lower end of which is provided with a hollow portionadapted to allow needle bar 50 to slide therein.

"I55 (Figures 7 and 8) pivot-ally mounted in a frame I56 fixed to themachine casing C. When I38 having a series of spaced notches I40 arshaftI31'and gear I36 mounted thereon to advance platform 13 apredetermineddistance in H the direction shown by the arrow. Gear I22 is mounted onthe same shaft as gear I22 and rotatestherewith. Gear I22 is driven bygear 36 which in turn is fixed to the pulley 32 for rotation therewith.The mechanism just described is so designed. as to cause platform I3 totravel a predetermined amount after each stitch.

It is well known by those familiar with the art that the needle employedin machines of the type described must be occasionally changed forvarious reasons. It is desirable, therefore, that this v be done asquickly as possible. To facilitate the quick removal and replacement ofthe needle, we

. have devised a mechanism which will now be dehandle I55 is presseddownwardly, the lower forked end of said handle will engage theunderside of stop I53 to raise the same and thereby release needle 52 inthe manner just described.

It has been found in the course of the operation of stitching machinesof the. character described, where the upper and lower needle bars arein alignment, that occasionally the thread would be found tooverlie thehole of the lower chuck so that when the needle travels downwardly to begrasped by the lower chuck it is apt to pierce the thread whichinterrupt its path, to break said thread. This obviously causes a delayinasmuch as it then becomes necessary for the operator to stop themachine and rethread the needle and start all over again. We havedevised a novel means for overcoming this disadvantage which consists inpositioning the needle hole in the lower needle chuck 90' to one side ofthe pointed portion thereof. By this construction it is seen that thethread T is not able to rest over the needle hole in lower chuck 90',but will tend to slide down to either side due to the pointedconstruction as well as the positioning of the needle hole.

When operating machines of the character described by power means, suchas a motor, it has been found desirable at times for certain reasons,

such as making trial stitches, to operate the machine by hand. The meansby which we accomplish this in connection with our apparatus may bedescribed as follows:

Positioned within the central portion of pulley 32 is a clutch mechanismI60 shown in detail in Figure 4. This mechanism operates on a principlesimilar to that used in free wheeling devices. A disc member I63, of theclutch I 60, is rigidly at tached to a collar IBI which idles on shaft33. A

' plurality of spaced notched portions I62 are cut out of thecircumference of disc I63. Into these notches are fitted rollers I64. Itwill be noted that disc I63 is of lesser diameter than the interio-ropening in pulley 32, thus permitting said disc I63 to rotate freelywithin the pulley 32.

Fastened to the disc portion I63 of the clutch I60 at one end is a handwheel 39, as shown in Figure 3, adapted to rotate with said disc I63.

awaits:

ltwi lebe seenafrom; t1 .le -.a b0ve; described con totienhthat w enevert eq a dtwhe 39 i-s rota ed in be held in notchedportionsi62 and disc:i631 will. be perm ,ted to rotate treely without reflecting thelrotation of pulley-32.; However, when the llfll'a-vwheeldw is rotated-ina counterclockwise direction, opposite; to thatshown-by the arrows inL-Eigures'Ba-and 4,; rollers: H34 will-.- then. be freed 'o kwi e di ctin; a in ica d by Y thqfilimws-lrt Eignres henddthe rol-lersslfil willfrom thenotched portions! 6-2: toengageetheinner suriafie oipulievtizto; lock disc i 63,to said pulley for rotation therewith Thusit isseen thatwhem.

even-it'isxdesiredto operate the,stitching machine v by hand it ismerely necessary to turn the hand wheel in a direction opposite to thatshown by the ow "i Ei ht en-a ds andm so do n -r. the

,machinetwill operate-similarlv to thatot theop erationwhen powertmean-sis used '1 Shoulditj-be desiredto operategour apparatus" to a allaxwehevepr v d a ut m t switching; mechanismedapted to. close acircuit tostartlt e motorwwhena;lever-mechanism isitrip-ped anddc: cause saidcircuit to be broken to stop I the, apparatus when theworkplatform hasitraveledl apredetermineddistance In- E! M 1- 8 weheve own a wirin diaillustrating onejmeans for accomplishing this rei sult; When lever; llhtis turned in the ldirection or the j arrow B, a catch mechanism I'll istripped toclose the; contact'spl 'll ofthe 1switch-S;by meansof asprinaBin order tocomplete a circuit from a sourc of current;su-pplwthrough;themotor M whichqris; ener ized-4'00- cause platform 13: to travel inthedirection of: arrow ;A;; Fastened to platiorm an r v h wi h is a pr ie teue- 13' t adapted-tostriheagain-st! a-projeeting portion S1of-switchS-r Lug, l l3 vmay; be positioned at a pre-- determined:distance from theprejectingv portion, a

of switch 3', suclr for v example as is necessary I12 are opened againstthe action of the spring-R tobreak the circ t and stop motor M. Thelever Hfl may; then bemade to re-engage catch Hi to for-the:completeystitch-ing of atie. When lugs I13" strikesprojectingj portionotswitch; Sj, contacts hold contacts l-1-2.; open until itis; desiredto013-.

crate: the: machinei-tostitchanother ;tie.- 1 thusbe seen that there isprovided; a

device e th o tions; nracticat use:

Asv various possible" embodiments-l might be a e of titheb ve vetionrfendza o s.

- changes, might be made in the embodiment-set 1 thvi 3 e: und rte dt ht'al z matter h n. se s tha r sh wn th accom a y n rawmes is b interpeted, a l st a ive a d. 9

in a l'imiting,sense-v t tist im d is r 1- I stami a-machine, th cobinatio f needle having a thread associated; therewith a need e ba .=rch mtine i said ee le. a sta -.1

iomrr surnortltbr .sa dtn edl dap e permit vertical movement of saidneedle. bar

e n mnera ineiw thl pposite i f said needle f naintainine said, thread.in prope relationshipwithsaid needle to prevent entangleit f aid h ea lsd ast named ans c prising J a, pair of'm'embers normally in contactwith; opposite; sides of said. needle, means sup which: the-several objects; of this. in-, ventionare achievedand-whichds well adapted totfective use 7 I v 5. In a sewing machine, the combination of ,a

needle having -,a thread. associated therewith a needle lbar cooperatingwith said needle, a star tionary support for said needle baradapted topermit vertical. movement of said needle bar, a

iloopermember for forming said thread into a loop, means ,for-maintaining said thread in proper relationship with said needle, toprevent machine, the combination of a threadassociated therewith, a

needle'bar,cooperating with, saidneedle, a, stationary support for saidneed1e ,ba-r adapted to permit vertical. movement means for maintainingsaid,thread in proper 1'8 latipnship with said needle to prevententanglement of said thread, saidlast named meanscomprising opposed.members mounted, on said sta- M DIIOrt, means.to imovines idmembe itowards. eachuQther: to en a eflopposite sides of saidneedle, and meanscoactingl with said mem here for movingtsaid members out of engage-vment with the oppositesidesof said needle at predetermined. intervals.,to free. said thread f or. effective user t 4. In a sewing machine, thecombination of alternately operating needle bars, a needle having athread associated. therewith, means I to alter:

nately connect ,the needle with, each, needle bar,

stationary supports .for said needle bars adapted to permit vertical,movement of said needle bars,

means associated with-each of said needle bars formaintainingsaidtlireadin roper alignment withsaid needletoprevent entanglement ofsaid thread, said last namednieans, being mounted onsaidstationarvsupports andvadapted to engage opposite sides-lof saidneedle, and means whereby I saidthread maintaining means is caused todis engagethe oppcsitesides not said needle .at predetermined intervals;tofree said thread fs ri efneedlehaving a thread. associated UhQEGWitha,

need-lebar cooperating with said needle, a stationa-ry support for saidneedle bar adaptedto permit vertical movement of said needle bar, andmeans cooperating with oppositesides of said needle-for maintaining:said thread in proper relationship withsaid needle to prevententanglementof said thread, 1 said i last ,namedmeanS comprising a pairof opposed members pivctally.

mounted on saidstationary-support and movable in opposite directionstoand from each other, intoand out-of engagementwith said needle 7 6. In asewing machine, the combination of a needle-adapted to receive ,athread, a needle bar,

cooperating with said needle, a stationary support for'said needl baradapted to permit ver tical movement .,of saidvneedle bar, means foraintai n ai th ead in Pr p r on h with said needle to prevententanglement of said thread, said, last .namedimeans comprising Q1)-posedmembers movably mounted on said stationarylsupport, meansionmovingsaid members toporting each of" said members for independentmovement to'and from each 7 other; and means i or moving said membersin: opposite directions away m sa dne dle v 2'. In a sewing machine;thecombination of a wards each other to engage opposite sides of saidneedle, and means whereby said members are caused to disengage theopposite: sides of said needle at predetermined intervals to free saidthread for effective use;

' '7; In asewing' machine, thecombination with aneedle bar and a needlehaving a thread ass0-' ,of said needle ba d.

ciated therewith, a work table, a support mounting said needle formovement to and from said table, mechanism including oppositely movablefingers located above said table coacting with opposite sides of saidneedle for maintaining said thread in proper alignment relative to saidneedle to prevent entanglement of said thread, and means operative intimed relation to the movement of said bar for eiIecting the movement ofsaid mechanism into and out of engagement with said needle above saidtable.

8. In a sewing machine having a work supporting table, mechanism forprojecting a needle and a thread having a loose and a fixed end back andforth through work to be sewed and forming loops in said threadalternately above and below said table, a looper located above saidtable, mechanism for moving said looper into engagement with a loop ofthread above said table to pull thread through said work, said mechanismincluding means for interrupting the travel of said looper while holdingsaid thread engaged thereby away from said work and said needle, athread puller mounted beneath said table, and

mechanism operative after said looper has en gaged a loop of threadabove said table for moving said puller into engagement with a loop ofsaid thread away from said work, and means for moving said puller intoengagement with each alternate loop formed adjacent said first-named lbar to pull said loose end of said thread through said work while saidthread is held by said member.

12. In a sewing machine, the combination with a needle and alternatelyoperating upper and lower needle bars, of a support for said needlebars, means to alternately connect said needle to each needle bar forprojecting a thread having thread formed beneath said table to pull theentire loose end of said looper supported thread over said looper andthrough said work.

9. In a sewing machine, the combination with a needle and an upper and alower needle bar for projecting a needle with a thread having a looseand a fixed end back and forth through material to be sewed, and meansfor moving said upper bar towards said material to form a loop in saidthread and for moving said lower bar upwardly towards said material toform a loop in said thread below said table on alternate movements ofsaid bars, of a looper device mounted above said table, mechanism formoving said device from an inoperative position into engagement withsaid loop of thread formed above said table to pull a portion of saidthread through said work and support it thereabove, said mechanismincluding means for interrupting the travel of said looper while holdingsaid thread, a threadpuller mounted below said support, means operativeafter the engagement of said first-named loop of thread by said looperdevice and while said thread is supported thereby for moving saidthreadpuller to engage said second loop of thread beneath said support to pullsaid loose end of said thread over said looper device and through saidwork.

10. In a sewing machine having a needle and means for projecting saidneedle and a thread with a loose and a fixed end back and forth throughwork to be sewed, a material support, a revolving thread puller locatedbeneath said support, a looper located above said support and arrangedto pull a portion of said thread through said work, mechanism for movingsaid looperto engage and support a portion of said thread away from saidneedle, including means for interrupting the travel of said looperwhiiei'said thread is supported thereby, and separate means operativeindependently of said looper operating mechanism for moving said pullerto pull said loose end of said thread from said looper and through saidwork.

11. In a sewing machine, the combination with a pair of needle bars andmeans for moving said bars, and projecting a needle with a thread havafixed and a loose end back and forth through work to be sewed, meanstimed with said alternately operating needle connecting means andcooperating with said upper needle bar for forming said thread into aloop, said last-named means comprising a looper device, mechanism formoving said'device past said upper bar from an inoperative position atone side of said upper bar into engagement with said looped thread topull a portion only through said work and displace said thread relativeto said needle, said mechanism including means for supporting saidthread away from said work, and a thread puller cooperating with saiddevice, driving means for operating said pullerior pulling the loose endof said thread through said work while said thread is supported by saiddevice, and means forming a part of said mechanism operative at theconclusion of the operation of said puller driving means for return;

ing said device in a different direction past said upper bar to saidinoperative position after the operation of said puller.

13. In a sewing machine, the combination with a needle, of a needle barcooperat ng with said needle, a support for said bar constructed andarranged to move said needle and a thread having a fixed and a loose endback and forth through material to be sewed, a material supportingsurface, means for movin said bar relative to said surface to form loopsin said thread, a looper device mounted for movement to and from saidbar, and mechanism for moving said device from an inactive positionadjacent one side of said bar intoengagement with each loop as formed topull a portion only of said thread back through said work and displacesaid thread away from the path of travel of said needle, said mechanismincluding mean for interrupting the movement of said device at the otherside of said bar for supporting said thread away fro-m said work duringstitch formation, and meansfor returning said device to said inactiveposition for the formation of the next stitch.

14. In a sewing machine, the combination with a needle and an upper anda lower needle bar for projecting the needle and a thread having a fixedand a loose end back and forth through work to be sewed, means formoving said upper bar and needle downward to form loopsin a threadcarried by said needle alternately on opposite sides of said work, alooper device located adjacent said upper needle bar, mechanism formoving said device into engagement with each loop formed adaa'z'aioajacent said upper bar to displace thread away from said needle andsupport the same away from said work, said mechanism including means forinterrupting the movement of'said device while said thread is supportedaway from said work, a thread puller positioned adjacent said lower bar,and means operative while said device is supporting said thread formoving said puller to pull said loose end of said thread from saidlooper and through said work.

15. In a sewing machine, the combination with a needle and a pair ofopposed needle bars arranged in opposition one to the other forprojecting said needle and a thread back and forth through material tobe sewed, of means for moving on ofsaid bar downward to'form a loop insaid thread proximate said material, opposed, separately movable meansmounted adjacent opposite sides of said bar and cooperating with saidneedle to prevent said thread from crossing its path, a looper member,mean mounting said member for movement back and forth along the samepath past said bar, means for operating said member in conjunction withsaid. opposed separately movable means, mechanism for movin said memberfrom an inoperative positionto engage a part of said loop away from saidneedle to provide slack in said thread and support the same in formingeach stitch, said mechanism including means for interlrupting themovement of said member for a part of each cycle, and means forreturning said memher to said inoperative position- 16. In a sewingmachine, the combination with needle and coacting with said bar toprevent said thread from crossing its path, a-looper member,

meansmounting said member adjacent said bar,

mechanism operating in conjunction with said lastnamed means for movingsaid member into engagement with a part of said loop to displacea-portion 01' said thread away from said needle to provide slack in saidthread, said mechanism including means for interrupting the movement ofsaid member to support said thread away from said work during eachcomplete movement of said member, and means operating in timed relationto the movement'of said bars for pulling said a needle and a pair ofopposed needle bars arloose end 'back and forth through material to besewed, of means for moving one of said bars downward to form a loop insaid thread proximate said material, means cooperating with said memberis interrupted.

17. In a sewing machine, the combination with a needle, and an upper anda lower needle bar coacting with said needle, of supports for said barsconstructed and arranged to move said needle and a thread having a fixedand a loose end back and forth through material to be sewed, means formoving said upper bar downward with said needle to form a loop in saidthread adjacent said material, a single looper member, mechanism formoving said looper member back and forth relative to said upper baralong an arcuate path less than to engage and pull a portion only ofsaid looped thread and provide slack therein, said mechanism includingmeans for interrupting the movement of said member during a portion ofits travel, and a thread puller positioned for coaction with said lowerbar while the movement of said member is interrupted to pull the looseend of said thread over said member and through said material.

RUDOLF NAFTALI. VALENTINE NAFTALI. HENRY NAFTALI.

